Improvement of Current-Voltage Characteristics in Organic Light Emitting Diodes by Application of Reversed-Bias Voltage
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概要
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The effects of reversed-bias application on current-voltage and luminance-voltage characteristics of standard-type double-layer organic light emitting diodes [OLEDs], ITO/TPD (50 nm)/Alq_3(50 nm)/Mg:Ag, were investigated. Both the magnitude of reversed-bias and the duration of reversed-bias application were systematically changed. Evident voltage shifts towards the lower voltage side in current-voltage and luminance-voltage characteristics were observed in the diodes which were treated under various reversed-bias condition. The longer the duration of reversed-bias application, the larger the voltage shift was. A maximum voltage shift of 0.7 V was observed in the diode treated under a -10 V bias for 3 h. Little change in luminance-current density relationships was observed for diodes which were treated under various reversed-bias conditions. The results were interpreted in terms of the movement of ionic impurities and orientational rearrangements of permanent dipoles in organic layers.
- 社団法人応用物理学会の論文
- 1998-11-15
著者
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Yahiro Masayuki
Department Of Applied Science For Electronics And Materials Graduate School Of Engineering Sciences
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Yahiro Masayuki
Department Of Applied Science For Electronic And Materials Graduate School Of Engineering Sciences K
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Tsutsui Tetsuo
Department Of Applied Science For Electronic And Materials Graduate School Of Engineering Sciences K
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Tsutsui Tetsuo
Department Of Applied Science For Electronics And Materials Graduate School Of Engineering Sciences
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ZOU Dechun
Department of Applied Science for Electronics and Materials, Graduate School of Engineering Sciences
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Zou Dechun
Department Of Applied Science For Electronics And Materials Graduate School Of Engineering Sciences
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